Update docs for integrating spring

[kazuki43zoo]

Purpose

Update and improve the documentation for integrating spring and spring-boot.

Approach

For Spring Framework Integration:

• Add how to add artifacts in pom.xml
• Add how to configure using xml namespace(<dozer:mapper>)
• Add how to configure using Java configuration
• Add how to use Mapper using dependency injection
• Fix package name of DozerBeanMapperFactoryBean
• Fix how to use Mapper using look-up from ApplicationContext(BeanFactory)
• Change bean name to dozerMapper
• Drop explanation for configuration using DozerBeanMapper directly (because does not use in xml based configuration)

For Spring Boot Integration:

• Add how to add artifacts in pom.xml
• Add how to configure custom dozer mapping files using properties or yml file

Open Questions and Pre-Merge TODOs

• Issue created
• Unit tests pass
• Documentation updated
• Travis build passed